Malicious PDF — malware analysis report

Static analysis result for SHA-256 c596f0ab302447d1…

MALICIOUS

PDF

71.9 KB Created: 2021-09-26 04:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0acbc0f2f95118dab2637489acdb2a0f SHA-1: 51d2e365a6a3cbbe9333da179fc2ae3137e2e1f7 SHA-256: c596f0ab302447d176107930474df37095cb4ffed8496e7c7572ae257e740d2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of a 'turbo vpn free download' UTM parameter suggests a potential lure for users seeking software, which could be a phishing or malware distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=turbo+vpn+free+download+for+android PDF link annotation
    • https://gangwontaxi.com/FileData/ckfinder/files/20210912_2BC3E8AED87B2187.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/18626005134.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/96671201441.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/57441964180.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/33757233805.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/53315468162.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/28470050976.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/88082680175.pdfIn PDF document text
    • http://dakmet.pl/upload/88812362712.pdfIn PDF document text
    • https://ratoempat.com/contents/files/wusoforifiso.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d11194cf29---kirebixa.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/1530809783.pdfIn PDF document text
    • http://mega.kz/media/upload/files/figojivi.pdfIn PDF document text
    • http://reylab.com/userfiles/file/welinozezafinimejor.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/gozubusomimogitowida.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/bevufeze.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/simoveveveteposesoruziri.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7a6f8cce2---4769367376.pdfIn PDF document text
    • https://forumsevens.com/images/file/zajusomutexexos.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149286733d6b---xujawomodagoxagijome.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/xebeludoxonazukumik.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/zuzugewaboju.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44B 10580 bytes
SHA-256: 0f9b9adf5d0717981fad9e69d1dff5074a96a60f757d93814128101cce3a7557
font_01_sfnt_off0000cc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE463 17332 bytes
SHA-256: a177b1cf72380fbad117c8a3a56f76c0fbcd1557e5dcdedcc7d4613a0aad455b